Another 6.2L engine failure!

[Chevy Man for Life]

185k on original 6.2L engine and 10 speed. 6" lift with 35" tires. Changed oil (Mobil 1 synthetic) when truck told me to. Original tranny with original fluid and no service or flush done. All highway miles. A/C compressor replaced at 155k. Oil cooler line replaced at 180k. Still daily driver. Love this truck.

 

This is my 3rd 6.2L vehicle (2008 Yukon Denali / 2018 Cadillac Escalade) with over 150k miles and no issues. Denali had broken motor mount at 100k.

[Grumpy Bear]

16 minutes ago, Chevy Man for Life said:

185k on original 6.2L engine and 10 speed. 6" lift with 35" tires. Changed oil (Mobil 1 synthetic) when truck told me to. Original tranny with original fluid and no service or flush done. All highway miles. A/C compressor replaced at 155k. Oil cooler line replaced at 180k. Still daily driver. Love this truck.

 

This is my 3rd 6.2L vehicle (2008 Yukon Denali / 2018 Cadillac Escalade) with over 150k miles and no issues. Denali had broken motor mount at 100k.

 

Thanks for the point of reference 

[KARNUT]

50 minutes ago, asilverblazer said:

What 'more' are you referring to?

 

I'm not asking anything more than what the LS engine has been doing basically for nearly three decades. 

 

They aren't spinning significantly faster, I doubt the loads placed on those components has changed significantly.

 

Even the oil weight has been the same since at least 2007, when 5w-20 was the spec for my Silverado. (The 2016 might be 0-20... don't fault the memory)

 

I wonder if a manufacture would ever do a 'limited' lifetime power train warranty, that covers more or less a long block, block (rotating assembly, heads, cam, LIFTERS, timing set) plus transmission internals.

 

I don't need an alternator, O2 sensor, radiator, etc. warranty, but if it requires a machin shop to fix...

 

Oddly enough, Kia (I think) used to offer something ridiculous on the power train, GM used to have a 5 year 100k power train, and some dealers offer 'engines for life' here. Without delving into the fine print...

 

More is cylinder deactivation. Kia-Hyundai Ive had 4. The warranty is the same 10 years 100K miles. My grandson drives the first one 05 Elantra GT. My wife drives the second one 2011 Genesis. The Genesis still performs as new and looks great. The Elantra looks rough. He’s not kind to it. The third was a Genesis coup. The fourth was a Santa Fe. Those were my daily drivers. I don’t keep them long. Kia is the same as Hyundai with the same warranty. I looked at the K-4 today. Too small, otherwise pretty good buy. Most of Hyundai and Kia’s have a performance upgrade. 

[CTHM732]

20 hours ago, Grumpy Bear said:

 

Curious, what would you consider a 'normal' AFM system lifespan? How long do you think one without is capable of? 

At least 150,000 miles. How long do I think one is capable of without AFM? On par with Gen III and IV LS’s; 200,000+miles. 

[Grumpy Bear]

12 hours ago, CTHM732 said:

At least 150,000 miles. How long do I think one is capable of without AFM? On par with Gen III and IV LS’s; 200,000+miles. 

 

I appreciate your sharing that. I would opine that you then hold the same view as the majority. 

 

I do note the + behind the 200,000 of the earlier models. I expect this means you would not find it unusual to run across pre-AFM/DFM engines with considerably higher miles which begs the question; at what point would you start to be impressed and say, "Now that's truly exceptional"? 

[asilverblazer]

On 6/12/2026 at 2:27 PM, KARNUT said:

More is cylinder deactivation.

I included the first gen-cylinder de-activation (active fuel management) in my statement.

[asilverblazer]

On 6/13/2026 at 9:01 AM, Grumpy Bear said:

I do note the + behind the 200,000 of the earlier models. I expect this means you would not find it unusual to run across pre-AFM/DFM engines with considerably higher miles which begs the question; at what point would you start to be impressed and say, "Now that's truly exceptional"? 

My take:

I don't think seeing up to 200k on the odometer of any of these engines/trucks (2014-to present) is surprising. (Excluding the known DEFECTS, specifically, the 6.2 main/connecting rod bearing issues, the defective lifters, alternatively parts that a recall was issued for - I think there were three.)

 

250K is my line in the sand, anything over that is 'surprising', but not limited to the engine making it that far but including the truck surrounding it too. (We've talked about this in other posts, why I think the engine isn't the deciding factor for ultimate mileage.)

[MASONV88888888]

My 2025 Silverado 1500 had to receive a brand-new engine (long block) under warranty last month at only around 16,500 miles.

Before the replacement, the truck repeatedly displayed "Engine Oil Level Low" warnings, even though the Oil Life Monitor still showed around 50% remaining after about 6,000 miles since my last oil change. After seeing the warning several times, I checked the dipstick with the engine cold, and the oil level was completely normal. The next day, the message escalated to "Add Engine Oil."

At first, I assumed it was just a faulty oil level sensor, so I brought the truck to the dealership. After inspecting the engine, they found internal cylinder wall scoring and ultimately replaced the entire long block under warranty. Before this happened, I was planning to install a 4-inch lift and suspension upgrade on my truck. After needing a new engine at just 16,500 miles, I honestly don't see the point anymore.

I also contacted GM to ask whether my vehicle qualified for a buyback, but I was informed that it does not at this time.

Anyway, this experience has left me with serious concerns about the long-term reliability of this engine. I sincerely hope NHTSA expands the current investigation or recall to include 2025 model and performs a thorough inspection of affected vehicles.

My biggest concern is that these engines may fail shortly after the powertrain warranty expires. If GM truly stands behind this engine, then at the very least, please consider extending the powertrain warranty to 10 years for affected owners. That would go a long way toward restoring customer confidence.